Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/third-party/bazel/BUILD.sigslot.bazel

@@ -0,0 +1,16 @@
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "cmake")
+filegroup(
+    name = "all_srcs",
+    srcs = glob(["**"]),
+    visibility = ["//visibility:public"],
+)
+
+cmake(
+    name = "sigslot",
+    cache_entries = {
+        "SIGSLOT_COMPILE_EXAMPLES": "OFF",
+    },
+    lib_source = "@sigslot//:all_srcs",
+    out_headers_only = True,
+    visibility = ["//visibility:public"],
+)